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Size Basic Major Diameter Basic Pitch Diameter Minor Diameter Minor Dia. Area Tensile Stress Area
Size Primary Size Secondary External Thread Internal Thread
inch inch inch inch inch inch sq. inch sq. inch
*   2.5000 2.3376 2.2023 2.2294 3.72 4.00
  25/8 2.6250 2.4626 2.3273 2.3544 4.16 4.45
23/4*   2.7500 2.5876 2.4523 2.4794 4.62 4.93
  27/8 2.8750 2.7126 2.5773 2.6044 5.11 5.44
3*   3.0000 2.8376 2.7023 2.7294 5.62 5.97
  31/8 3.1250 2.9626 2.8273 2.8544 6.16 6.52
*   3.2500 3.0876 2.9523 2.9794 6.72 7.10
  33/8 3.3750 3.2126 3.0773 3.1044 7.31 7.70
*   3.5000 3.3376 3.2023 3.2294 7.92 8.33
  35/8 3.6250 3.4626 3.3273 3.3544 8.55 9.00
33/4*   3.7500 3.5876 3.4523 3.4794 9.21 9.66
  37/8 3.8750 3.7126 3.5773 3.6044 9.90 10.36
4*   4.0000 3.8376 3.7023 3.7294 10.61 11.08
  41/8 4.1250 3.9626 3.8273 3.8544 11.34 11.83
  4.2500 4.0876 3.9523 3.9794 12.10 12.61
  43/8 4.3750 4.2126 4.0773 4.1044 12.88 13.41
  4.5000 4.3376 4.2023 4.2294 13.69 14.23
  45/8 4.6250 4.4626 4.3273 4.3544 14.52 15.1
43/4   4.7500 4.5876 4.4523 4.4794 15.4 15.9
  47/8 4.8750 4.7126 4.5773 4.6044 16.3 16.8
5   5.0000 4.8376 4.7023 4.7294 17.2 17.8
  51/8 5.1250 4.9626 4.8273 4.8544 18.1 18.7
  5.2500 5.0876 4.9523 4.9794 19.1 19.7
  53/8 5.3750 5.2126 5.0773 5.1044 20.0 20.7
  5.5000 5.3376 5.2023 5.2294 21.0 21.7
  55/8 5.6250 5.4626 5.3273 5.3544 22.1 22.7
53/4   5.7500 5.5876 5.4523 5.4794 23.1 23.8
  57/8 5.8750 5.7126 5.5773 5.6044 24.2 24.9
6   6.0000 5.8376 5.7023 5.7294 25.3 26.0
inch inch inch inch inch inch sq. inch sq. inch
Size Primary Size Secondary Basic Major Diameter Basic Pitch Diameter External Thread Internal Thread Minor Dia. Area Tensile Stress Area
Size Minor Diameter
* Standard Sizes of the UNC series
Glossary